diff --git a/src/Psalm/Internal/Fork/Pool.php b/src/Psalm/Internal/Fork/Pool.php
index 9c4792866..e0c0c0cae 100644
--- a/src/Psalm/Internal/Fork/Pool.php
+++ b/src/Psalm/Internal/Fork/Pool.php
@@ -54,8 +54,8 @@ use function version_compare;
  */
 class Pool
 {
-    const EXIT_SUCCESS = 1;
-    const EXIT_FAILURE = 0;
+    const EXIT_SUCCESS = 0;
+    const EXIT_FAILURE = 1;
 
     /** @var int[] */
     private $child_pid_list = [];